For example, a 1995 Lamborghini Diablo SE30 Jota set a record for the model when the hammer dropped at 672,000 euros (about $760,000), while a 2004 Aston Martin DB AR1 sold for a record 336,000 euros (about $380,000).

Here are the 10 highest prices seen at RM Sotheby's and Bonhams in Monaco this past weekend: